Closed space active noise reduction electric experiment device
An active noise reduction and experimental device technology, applied in measurement devices, sounding equipment, instruments, etc., can solve problems such as poor tracking ability of non-stationary input signals, inability to balance convergence speed and steady-state error, and ensure stability and reliability. performance, reduce noise reduction error, and reduce the effect of experimental error
Pending Publication Date: 2020-06-19
JILIN UNIV
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Problems solved by technology
However, the FxLMS algorithm with a fixed step size still has some shortcomings, such as the incompatibility between the convergence speed and the steady-state error, and the poor tracking ability of the non-stationary input signal, and the variable step size FxLMS algorithm can improve this problem, so become the subject of research by many scholars
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[0069] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.
[0070] Such as Figure 1-2 As shown, the closed space active noise reduction electric test device provided by the present invention includes: a closed box 110 , a primary sound source and a secondary sound source 160 , a ball screw mechanism module 130 , an electric push rod 140 and a microphone 171 .
[0071] Such as Figure 3-4 As shown, the closed box 110 is a cuboid structure, and the length, width and height of the box are cube cavities whose edge length is 60cm×60cm×80cm. The closed box 110 includes: a bottom plate 111, a first side plate 112, a second side plate 113, upper cover plate 114, rear cover plate 115 and front cover plate 116.
[0072] One end of the first side plate 112 is supported on one side of the bottom plate 111; one end of the second side plate 113 ...
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Abstract
The invention discloses a closed space active noise reduction electric experiment device. The device comprises a closed box body; a primary sound source detachably fixed on the side wall of the closedbox body; a secondary sound source detachably arranged on the side wall of the closed box body and located at the top of the primary sound source; a ball screw module detachably arranged at the bottom of the closed box body; a microphone connected with the ball screw module in a sliding manner. The closed space active noise reduction electric experiment device is developed and provided with the closed box body, a closed sound field environment can be created, the microphone is pushed by the ball screw module to move in the closed box body, and the operation simplicity can be improved. The invention further provides a control method of the closed space active noise reduction electric experiment device, the position of the microphone can be accurately controlled, the noise reduction error is reduced, and the experiment error can be reduced to the maximum extent.
Description
technical field [0001] The invention relates to the technical field of active noise reduction devices, in particular to an electric experimental device for active noise reduction in a closed space. Background technique [0002] With the continuous development of active noise control (ANC) technology, its application has expanded from the original one-dimensional space to three-dimensional space, and closed three-dimensional space is a common research scene, such as automobiles, airplanes, air-conditioning equipment, etc. Wait. Active noise reduction in a three-dimensional space is much more complicated than in a one-dimensional space, especially in a closed space, where the sound field environment is more complex, so initial experiments before specific applications are particularly important. [0003] Active noise control is to use the principle of interference and cancellation of sound waves to generate a series of sound waves with the same amplitude as the noise and oppos...
Claims
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Login to View More IPC IPC(8): G01H17/00G10K11/178
CPCG01H17/00G10K11/178
Inventor 陈书明蒋尧孟豪吴开明葛平玉
Owner JILIN UNIV